"Doocy asked Trump if he was asking Gulf countries to invest in any such fund. The president replied, "No, I'm not."
"If they do it, fine. But I would say they won't be doing it for a while until they find out the behavior. It's a behavior thing, but we are not investing. That's a false story that got picked up incorrectly," Trump said."

Let me translate for you:
The US won't be putting anything at all financially into Iran. Arab allies are not being asked to do so either. It is in the interest of Arab allies to have a stable, well-behaved iran, and so they could decide on their own to invest in Iran, but they certainly would not be doing so until they see reassurances of good behavior down the road - but again, that is up to them. The Us does not get in the way of other allied countries decisions.